Plant Pathology Department


Date of this Version



UNL CropWatch, August 26, 2016


Copyright 2016 UNL


Bacterial leaf streak disease of corn, caused by Xanthomonas vasicola pv. vasculorum, has now been confirmed in Nebraska, as well as in Colorado, Illinois, Iowa, and Kansas. The disease had not been previously identified in the U.S., but had been reported on corn in South Africa. Surveys are currently underway across the Corn Belt to identify the disease distribution. Initial observations and survey results suggest that it may be widely distributed throughout the Corn Belt. Unusual symptoms were first reported on corn samples received by the University of Nebraska Plant and Pest Diagnostic Clinic. Over the last two years, the clinic has received disease samples from numerous counties across much of Nebraska, indicating the disease may be widespread and producers and others should be monitoring for its development. No research evidence is available to predict its potential impact on yield. Confirmation of the disease identification was delayed because of the lack of historic research on the pathogen and limited data on this bacterium and its close relatives. Advanced testing procedures were conducted on the bacteria at multiple institutions to confirm its identity. Third party confirmation was conducted by USDA-APHIS.